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Related theorems GIF version |
| Description: Introduce conjunct to both sides of an implication. |
| Ref | Expression |
|---|---|
| anim1i.1 | ⊢ (φ → ψ) |
| Ref | Expression |
|---|---|
| anim1i | ⊢ ((φ ⋀ χ) → (ψ ⋀ χ)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | anim1i.1 | . 2 ⊢ (φ → ψ) | |
| 2 | id 59 | . 2 ⊢ (χ → χ) | |
| 3 | 1, 2 | anim12i 333 | 1 ⊢ ((φ ⋀ χ) → (ψ ⋀ χ)) |